L78M15ABV-DG

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The L78M15ABV-DG voltage regulator is a three-terminal, fixed-output, linear voltage regulator designed with a large output voltage range. It is a PMIC (power management integrated circuit) that is designed to convert a specified input voltage to an output voltage that is adjustable over a large range. This regulator is ideal for applications such as filtering and sensing, switching power supplies, and portable instrumentation. It is one of the most widely-used linear voltage regulators, included in the Linear Voltage Regulators family of PMICs.

This regulator operates in a non-inverting, linear regulation mode with an output voltage that is adjustable from 1.5V to 15V. Positive and negative voltage polarity pins are available for both the regulator’s input and output. An enable input pin is also included for flexibility in circuit applications. This feature allows the regulator to be connected in a multi-rail system and only enabled when needed.

The L78M15ABV-DG regulator features an internal thermal shutdown protection as well as short-circuit current limiting. These safety features help extend the life of the regulator, as well as ensure correct operation. Additionally, internal compensation and soft-start reduce output-voltage overshoot, while soft shut-down prevents unwanted inrush current when powering down the regulator. This regulator can provide up to 800mA of output current and operates at a junction temperature up to 150°C.

The L78M15ABV-DG voltage regulator is designed to provide a stable, accurate output voltage for a variety of applications. It has low power consumption, a wide input voltage range and excellent load and line regulation, making it suitable for a variety of portable or distributed power systems. Furthermore, its high output current capability and thermal protection make it an ideal choice for powering applications such as motor controllers and DC motors.

The basic working principle of the L78M15ABV-DG regulator is simple. Its input voltage is compared to an internal reference voltage and the difference is determined. This difference, the error voltage, is then amplified by a fixed gain and applied to the base of the free-running pass transistor, which is connected in series with a control electrode. The pass transistor, along with two voltage divider resistors, limits the output voltage to the desired level, and the amplifier ensures that the output will remain regulated even with line or load variations.

Although the L78M15ABV-DG voltage regulator is primarily used for voltage regulation in portable and distributed power systems, other applications include local power supplies, microcontrollers, audio power amplifiers, and medical devices. Its flexibility, accuracy and low power consumption make it a popular choice for many power management applications.

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